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| Greenwich |
a borough of London, England, through which the prime meridian passes. |
| Greenwich time |
the solar time that is determined at the prime meridian through Greenwich, England, and that is used to calculate and regulate time throughout most of the world; Greenwich mean time. |
| hemisphere |
either of two halves of the terrestrial globe, formed by dividing it into northern and southern parts at the equator, or into eastern and western parts at the prime meridian. [1/3 definitions] |
| International Date Line |
(sometimes l.c.) an imaginary north-south line drawn in the Pacific Ocean, roughly at the 18th meridian, on the east side of which, by international agreement, the calendar date is one day earlier than it is on the west side; date line. |
| long. |
abbreviation of "longitude," the angular distance on the earth's surface east or west of the prime meridian at Greenwich, England, measured either in degrees or in hours, minutes, and seconds. |
| longitude |
the angular distance on the earth's surface east or west of the prime meridian at Greenwich, England, measured either in degrees or in hours, minutes, and seconds. |
| meridian |
of or pertaining to a meridian. [2/7 definitions] |
| polyconic projection |
a type of map on which the latitudinal lines are represented as the arcs of circles with different centers along the straight central meridian, and the other longitudinal lines are shown as curves. |
| prime meridian |
the meridian passing through Greenwich, England, used as a starting line for the measurement of longitude east and west. |
| standard time |
the time officially designated in any of the world's twenty-four time zones, which is based for the most part on that zone's distance from the Greenwich meridian. |
| time zone |
any of twenty-four longitudinal divisions of the earth that are roughly defined by their distances from the prime meridian, and each of which keeps a standard time one hour earlier than does the zone to its east. |
| transit |
the passage of a celestial body across the face of another or across the meridian or the telescopic field of an observer. [2/7 definitions] |
| transit instrument |
a telescope mounted so that it can be rotated only along a longitudinal meridian, used to observe and measure the transit time of celestial bodies across that meridian. |
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